LAUSR

Zn1 − xMnxO (x = 0.002–0.01) nanoparticles were synthesized by co-precipitation method. The detailed crystal structure and compositional characterizations were characterized by the XRD patterns, Raman spectra, XPS, HRTEM and SEM. the XRD and XPS results show the Mn2+ ions are substitute for Zn2+ ions in the ZnO matrix. In the Raman spectra, the E2(high) peak shifts to lower frequency and the higher intensity of A1(LO) peak appears in the sample with increasing doping concentrations of Mn, indicating a higher concentration of donor defects are introduced in ZnO nanoparticles. Then, the carrier concentration induced by oxygen vacancies are analyzed from the optical absorption spectra. By analyzing the O1s XPS spectrum by Lorentz fitting and PL spectra by Gaussian fitting, the oxygen vacancy concentration increases with Mn doping concentration. The present results suggest that the doped Mn2+ ions play a significant role on enhancing the carrier concentration of ZnO materials.